mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 23:25:37 +07:00
8f6eec13b1
Add documentation for the controls present in the SPDIF input controller driver Signed-off-by: Damien.Horsley <Damien.Horsley@imgtec.com> Signed-off-by: Mark Brown <broonie@kernel.org>
50 lines
1.7 KiB
Plaintext
50 lines
1.7 KiB
Plaintext
The Imagination Technologies SPDIF Input controller contains the following
|
|
controls:
|
|
|
|
name='IEC958 Capture Mask',index=0
|
|
|
|
This control returns a mask that shows which of the IEC958 status bits
|
|
can be read using the 'IEC958 Capture Default' control.
|
|
|
|
name='IEC958 Capture Default',index=0
|
|
|
|
This control returns the status bits contained within the SPDIF stream that
|
|
is being received. The 'IEC958 Capture Mask' shows which bits can be read
|
|
from this control.
|
|
|
|
name='SPDIF In Multi Frequency Acquire',index=0
|
|
name='SPDIF In Multi Frequency Acquire',index=1
|
|
name='SPDIF In Multi Frequency Acquire',index=2
|
|
name='SPDIF In Multi Frequency Acquire',index=3
|
|
|
|
This control is used to attempt acquisition of up to four different sample
|
|
rates. The active rate can be obtained by reading the 'SPDIF In Lock Frequency'
|
|
control.
|
|
|
|
When the value of this control is set to {0,0,0,0}, the rate given to hw_params
|
|
will determine the single rate the block will capture. Else, the rate given to
|
|
hw_params will be ignored, and the block will attempt capture for each of the
|
|
four sample rates set here.
|
|
|
|
If less than four rates are required, the same rate can be specified more than
|
|
once
|
|
|
|
name='SPDIF In Lock Frequency',index=0
|
|
|
|
This control returns the active capture rate, or 0 if a lock has not been
|
|
acquired
|
|
|
|
name='SPDIF In Lock TRK',index=0
|
|
|
|
This control is used to modify the locking/jitter rejection characteristics
|
|
of the block. Larger values increase the locking range, but reduce jitter
|
|
rejection.
|
|
|
|
name='SPDIF In Lock Acquire Threshold',index=0
|
|
|
|
This control is used to change the threshold at which a lock is acquired.
|
|
|
|
name='SPDIF In Lock Release Threshold',index=0
|
|
|
|
This control is used to change the threshold at which a lock is released.
|